This article reviews observations and models of the diffuse ionized gas
that permeates the disk and halo of our Galaxy and others. It was
inspired by a series of invited talks presented during an afternoon
scientific session of the 65th birthday celebration for Professor Carl
Heiles held at Arecibo Observatory in August 2004. This review is in
recognition of Carl’s long-standing interest in and advocacy for
studies of the ionized as well as the neutral components of the
interstellar medium.

Tags

Atomic processes and interactions, Characteristics and properties of the Milky Way galaxy, Interstellar medium and nebulae in Milky Way, Interstellar medium and nebulae in external galaxies